```
**How it works**
* Double‑click anywhere on the page (outside the menu or toolbar) to create a new window.
* `Shift + dblclick` → Post‑it note window.
* Normal double‑click → Image window.
* Each window has a draggable header, a close button, a resize handle, and a coordinates display.
* The header title is editable and its value is stored in `localStorage` so it survives page reloads.
* Clicking a window brings it to the front (z‑index).
* In an image window, paste an image (`Ctrl+V`) from the clipboard – it will appear inside the body.
* In a note window, the body is a content‑editable area for free‑form text.
* The top menu bar offers standard items (File, Edit, Window, Help, Tools) with simple demo actions.
* A toolbar provides quick buttons to create new windows.
* The page background is a light 8‑bit‑style repeating pattern, and all windows use a blue DOS‑like theme.
All HTML, CSS, and JavaScript are contained in a single file, ready to drop into a browser.